Superior catalytic performance and CO tolerance of Ru@Pt/C-TiO2 electrocatalyst toward methanol oxidation reaction

•Ru@Pt/C-TiO2 was prepared by physical mixture and two-step ethanol reduction method.•Ru@Pt/C-TiO2 exhibited superior MOR activity and enhanced CO tolerance.•The enhanced MOR performance was due to bifunctional mechanism and electronic effect. Efficient removal of CO species binding with Pt active s...

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Bibliographic Details
Published in:Applied surface science 2019-04, Vol.473, p.943-950
Main Authors: Wang, Yajing, Wang, Jiankang, Han, Guokang, Du, Chunyu, Sun, Yongrong, Du, Lei, An, Meichen, Yin, Geping, Gao, Yunzhi, Song, Ying
Format: Article
Language:English
Subjects:
CO tolerance
Electronic interaction
Methanol oxidation
Ru@Pt/C-TiO2
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Summary:•Ru@Pt/C-TiO2 was prepared by physical mixture and two-step ethanol reduction method.•Ru@Pt/C-TiO2 exhibited superior MOR activity and enhanced CO tolerance.•The enhanced MOR performance was due to bifunctional mechanism and electronic effect. Efficient removal of CO species binding with Pt active sites during methanol oxidation reaction (MOR) is vital for an excellent electrocatalyst. In this paper, well-controlled Ru@Pt/C-TiO2 with much weakened CO adsorption was prepared as MOR electrocatalyst. The nanostructure shows enhanced electroactivity in MOR with peak current density of 1.08 mA/cm2, significantly larger than that of Ru@Pt/C (0.76 mA/cm2), Pt/C-TiO2 (0.66 mA/cm2) and Pt/C (0.34 mA/cm2). The stability and CO tolerance of Ru@Pt/C-TiO2 are also superior to that of Ru@Pt/C, Pt/C-TiO2 and Pt/C. This enhanced MOR performance is ascribed to bifunctional mechanism derived from TiO2 and strong electronic interaction between Pt and Ru, C-TiO2, weakening binding energy of CO adsorbed on Pt.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2018.12.211